Here's a review that explains things pretty well about the card [http://www.soundonsound.com/sos/may05/articles/edirolua101.htm].

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===Driver Installation===

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====Macintosh====

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====Windows====

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====Linux====

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===Changing Sampling Rate===

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Changing the sampling rate requires restarting the interface. Turn the SAMPLE RATE knob to the desired new sampling rate (normally 48 or 44.1kHz). Nothing actually happens until you restart the interface with the OUTPUT/POWER knob turned all the way down (counter-clockwise) until it clicks (the power light goes off). Turn it back to start. The knob then becomes the volume knobBetter to make sure you've got it set to the sampling rate set to what you think you will be working with, before you start your audio software. Just makes things cleaner. If you have to change the sampling rate while you are working with applications, first make sure you've saved your session files, doing so may have unpredictable results.

Quad Speaker System

UA-101 Audio Interface

Driver Installation

Macintosh

Windows

Linux

Changing Sampling Rate

Changing the sampling rate requires restarting the interface. Turn the SAMPLE RATE knob to the desired new sampling rate (normally 48 or 44.1kHz). Nothing actually happens until you restart the interface with the OUTPUT/POWER knob turned all the way down (counter-clockwise) until it clicks (the power light goes off). Turn it back to start. The knob then becomes the volume knobBetter to make sure you've got it set to the sampling rate set to what you think you will be working with, before you start your audio software. Just makes things cleaner. If you have to change the sampling rate while you are working with applications, first make sure you've saved your session files, doing so may have unpredictable results.